Roller journal



April 22, 1930.` M. FRlscH 1,755,250

` ROLLER JOURNAL Filed Feb. 9,A 1928' 2 sheets-sheet 1 l j 4 rdwzi, ,Timmy VAL April 22, 1930. M.' FRISCH 1,755,250 l ROLLER JOURNAL Filed Feb. 9, 1928 l '2 SheetsSheet 2 m Y n Y rufeT-.STE Wa? 9175 V 519 if l Bg 25m l (if orne `S Patented Apr. 722,'Y 1h93() f .Y MAnmNeRrseH,.beenmerg; M'Issen-RI;Assrenmeo.INTERNAMONALQQQMBUSMQN t ENGINEERING'..QQRPORATIOM er einem .N5 Y.,.;Af 'QOPGBATION .0F .DELAf Y 7 fiirventronmelates i'rnpf'reved .ineens forfrotatebly vsupperising;#and lubricating the "bearing-s. olt'. 1 'a pqlveriz-ngi'roller :tor e 16.4926.' ihr afnillof this typei,-ra plurality olli pnlverzin'g rollers' are 'pivote inra e'reulenseriesfrena`V Ote-t spieler;thev rollersswingngeutbyf eentrfw galfffereefegainstf the inner; sur-aee oit al xed circuler: tell i y v caught .between f' he ring an d rollers is pnl 'verfzed l' The-'presentinventionr relates Vto en improved form ofjournal supportrfor'ene of these rollers,l in lc,Onfrlbneton wsfitl-lfln# llysuspended proved means for kludereting'thebearings V betWeent-he ilxedenpportng sheftend'the- .Y i retateble assembly. Twp'forrns'oilnbri Y' 2o eating systeme are shown. f' having ynneny features in' common, one.E being e Teelt-Contained lubricating system for ee'elh rollerf-and the v other e orcedlfeed' system whereby I a lcontinnen-'sY flow'of lubricantisv provided through eff-stern is mede thesuhjeetrnatter ef e, separetey ep'plicvzlt/en, filed February 9,' '1928, Serial No. 253,0793'ends only elairnedfnthsf-ep l' uprightfpesition.

` rwhich=relller'lmeerings may be Aused.V E Y ..An0tl1er' 0b]ect'--1s to yprevlde unproved peellngf means 1 for preventlngf. the excessive escape of oil yory other lubricant: betvszeen'Y-theY porting shaft@ 'and' -v the r0.- A

'means for' f" deta'eha'bly supp Q'rtng vthe rel-ler from a rotating 'honsngfsoigthatf the `rellerf may be` removed.l end "replaced-Without Adis:` .turbng the"-roller5supp0rtng means.

@whereby the llrneterial Ls' @terprevi-de. mplvecllneans I for rotatably -rnrmrltin/g. and srqvpertng :n 'pulverzng rolle-r from a1 nonv rotatable shaft-y suspended in substantially.

Anether object ist@ provide envr improved;

. tron-9b journal snppert-for'e pulverlzrngroller `1n. f

Anotherfe'bject is te previdemprovedi v ottte Another object lsto provide,irnprfwed;`

means' for :maintaining en: upwerdlflew of @tlf-through# the:- bearings by means'fof Vwhich .the rollerwessembly isrtateblyl,supported. .llnethenobjeet 1s toy provide hnproved inerme a rer lpermlttlngg, e veontr11-1.1011efflfoW of` toil: or farther. lub reant through the bearings.v

-gtherrl objeets. and advantages olf thisy in- Ventron-willi be--more appare-nt ronrthe 1to1-.-

prayed f Aform-s of apparatus tnvelvngV the prznelplesgef theinvention';l j In.' the eeeompenying drawings: f

iFig; I t :ifs: central' vertical' section through f one approved form.y ef' the assembled .appetletting.' detailed description of'4 certain. ep-A }AtliandQfiereshQWn the errn's-V a eymkelen; thlerf rotating.: spider.. of 'the Teller mll.` Y *ln thesefefrmsi sy mounted vthe, :trvurmio'nxehazttfi bnrwh vis:s@eur-fedi:the-rocker memherffl! erscale; 'of ttheroll'erfassemblykshown:vi

Sew

t y reeghashe t! 6# rem end? toffendffthereef,l the Y .upperx perton: off this p'assegeibeingenlarged engagedfwith thenpperendol tube ample here shown. The closure member 28V 12 so as to separate the supply and return passages at their upper ends.V The trunnion 3 is bored out from one end to form an inlet passage 14 and an outlet passage 15.` A passage or conduit 16 bored out of the shaft 6,

.rocker 4, and trunnion 3 connects the annular return passage 12 in the shaft with the outlet passage 15 in the trunnion. A lateral passage 17 extends from the inlet passage 14 through the Ytop of the trunnion and rocker 4, and a screw plug 18 threaded into the top of rocker 4 forms a continuation of this passage. A tubular conduit 19 is connected with plug 18 by means of the cap nut 2O which engages over the enlarged head of tube 19. In anexactly similar manner, the other end of tubular conduit 19 isconnected by means of cap 21 and plug 22 with the cap 13 on shaft 6, so that the conduit 19 will form a continuation if the tube 12 and supply passage 10 in the.

shaft 6. A lixture 23 secured tothe end of trunnion shaft 3 is formed with two thread;

ed nozzles 24 (only one of which is illus#- trated) whereby flexible conduits 25 may be i zonnected with the respective inlet and outletV passages 14 and 15 by means of cap nuts 26.`

The connection to the inlet passage 14 vis at right angles to the connection illustrated in Fig. 2, extending upwardly. Y suitable apparatus, not here illustrated,but disclosed in my copending application Serial 253,079 hereinabove referred to, a continuous flow of oil is provided, in throughpassage 14 and out through passage 15. Y

A hollow sleeve or housing 27 surrounds the major portion of shaft 6 concentrically therewith but spaced therefrom as will be hereinafter apparent. A bottom closure member'28 extends around the lower end of .shaft 6, and is removably secured to sleeve or housing 27, the two members being provided with outwardly projecting' annular flanges 29 and 30 connected by bolts 31, in the eX- is hollowed out at 32 to form a well for lubricant. The pulverizing roller 33 is clamped to and suspended from the closure member 28, by means of a series of bolts 34, in the form of the invention shown in Fig.V 1. Alternatively, asshown in Fig. 5, theclosure member may be in the form'of a comparatively,V thin metal cap 35secured to the lower end of sleeve, and the "pulverizing, be bolted directly tothe lower end of the sleeve by means of bolts 37 extendthe supporting rollers 36 may ing through the roller and an outwardly prof jecting flange 38 at the lower end of the sleeve. It will also be apparent that the cap 35shown in Fig. 5 could be vornitted entirely,

; and the cavity 39fin the roller 36 be utilizedV as the lubricant well. f Returning again to the form of the invention shown in Fig. 1, Va nut 40 screwed onto the lower threaded end 41V of shaft 6, supports .I through Vwasher 42, a sleeve or bushing 43 By means ofr having an annular ring or nut 44 screwed onto its lower end. Sleeve 43 extends up practically the length of the housing 27 and slidably engages the outer surface of shaft 6 adjacent its upper and lower ends, the shaft 6 being slightly reduced between these points Y In this .form of the invention a roller thrust bearing assembly ;of any suitable type, the

example here shownbeing known as .Bower7 roller bearings, supports the sleeve `or housing 27 and parts carried thereby from the lower end ofshaft 6., `The annular series of rollersl Aare confined between an inner race ring 5 2 which surrounds sleeve 43 andis supported on nut 44,:and an outer race ring 53 j which fits within an annularrecess 54 in the lower end of sleeve 27. A similar roller bearing assembly 55 s provided adjacent the upper end of-sleeve 27, the inner race ring 56 being` confined beneath `the Voutstanding flange 48 at the upper end of sleeve or bushlng 43. Y i i i i A" helical rib or flange 57 projects inwardly Yfrom the inner wall of sleeve 27 into rather close proximity to thefsleeve 43, although Vit does not engage therewith. rlhis flange 57 is curved in such'a direction with relation to the direction of rotation ofthe rotating assembly, `that it will tend to positively lift oil or other lubricant from the well 32 and carry sameup through the annular space 47 between the rotating sleeve and theshaft. There is a natural tendency for this oil to travel upwardly, due to the rotation'Y of the Y flange 59 which extends lover the upper end 60 of sleeve 27, flange 59 being provided with a series of recesses 61, adapted to be lll).

selectively engaged bythe upperV end of a locking barv 62 secured to sleeve 27 by screw bolts `63. -The elevation of cap 58 may be properly adjusted Vby screwing the cap into or out of rlhese gaskets are adapted to sealv the jointV the sleeve 27, and it is then lockedV in adjusted position by means of the locking l sage l2. .head 64y of;` cap 58,@below the :gasket .66.l is" between theshaftandthe rotatingl assembly, f

and prevent thewexcessive escape of'foil. A; very slight escape-of oil is desirable in- .order to.V combatand preventfthe entrance'of dustl ythrouglrth-is.joint Thelower facefofcollai' v68 is'also'provided with a seriesl offpartially spiral .grooves 69 x(see Fig..4) also tendingtov worlragain-st the escape of oilthrough this: Joint' ,f y l l [Thewalls :ofthe-.cavity 70y in cap '58 are providedwith a spiral ribv or flange 71, similarto rib 57 in l*sleeve 27, @for-lifting oil through the space-within cap .58, abovefthe. roller.r bearing 55.' `Adjacent the vupper'v end of :cavity 70, a'plurality- :of radial passages extendinwardly to the annularreturn pas-- The inner cylindrical vsurface. `of

formed-.with la helical groove 73 "having an inclination opposite'tofthe inclination of ribs "'57 and 7l', so asito'tend toiprevent therise of oilffrom cavity 70 toward thexsealingy l gaskets 66and 67..

.When invuse, this roller will ,hangffreely withinfthe -milh and-will be permitted toV swingffreelyabout-:the of trunnion 8 so that centrifugal force .will-tendfto forcefthe pulverizingroller against the bull-ring. fis

the supporting; spider is rotated, therollcr will rollaround on .thefinnersurface of the bull ring, whereby the' ;rotatable assembly comprising the roll'erSS, cap/28, sleeve ory minor features carried by these elements will y yfrotateabout the'fixed shaft 6. l'lliesleeve or binding of parts.

housind27 can 58 Gaslrets66and'67 and bushingfl will notxordinarily move, but .may be Lforced upwardly against the: shock absorbing spring .ll'to ta-lie upverticalthrusts, Ian d can if'necessaryrotate about the shaft- 6 in case` of injury tothe-rollerl bearings, vor other and 'afterpassing through the upper roller bearing' 55- will be carried up by rib 7l vand pass-l out .through radial Vpassages 7 2 to the returnypassagel', thence throughpassage 16to'A the outlet passage VV15 in.the-trunniony u y a shaft, means-in which the upper portion shafti `Sonne of this-oil'wi'll tendtoescape through the jointfbetweenj cap ,58' and the shaft VGand collar L68,V but this escape rof oil. is largely prohibited ybythegaskets 66 andl 67,; and the oil-returningig-grooves173 and 69.

It it. beco-mes necessary to `remove lfor re placey the'fpulverizing rollerv 33, this may be donelby merely removing the bolts .Sil with. out disassembling the remainder ofthero4 tating. assembly. y Y

-flnthe modification shownr inlT lgs. .5 and 6,

a Aself-contained lubricating. system is used'` instead of the forced feed'system hereinabove described. ifllsm'roller-.bearings are not used yin this modification. :Many of the features of thisforin ofthe invention are substantially thesame as those previously described and will notbeagain referred to in detail.`` In j this modification,` the oil'V passages in the trunnion`3 and rocker will be omitted. A' singleY supplyv conduit 74- extends axially through'- out the ,length of the shaftk 6. A supply of' oil or other lubricant'isinsertedinto passage lf desired, the upper'portion vof passage 74 7e byremovin'g'tlie cap 75 lfrom vtheuppen end of the threaded portion 9jofgthe shaft.'

maybe enlarged to form areservoir fenster-f ing lubricant, or a reservoir maybe connected to the uppere'ndV of passage=7ll-- Y Y A thrust'collar 76 is .carried by-:the lowerend vof shaft 6, the vcollar here being shown in the form of a nutthreaded onto theireev n duced end 77 of the, shaft. .The supporting sleeve or housing 78,' which *is generallyl 'of the same form as the housing '27 ofv Fig. f1,

has an inner collar 79 atv its lowery end in whichr is: mountedl the bushing 8O E having-fan. outwardly'flang'ed lower. end 8l, between which and the thrust'. collar 76V isinterposed a .thrustiring 82. A; plurality of coredor drilled oil passagesSS extend up through collark portion 79, connecting=the lower'oil `well184lgwiththe oil space 47 in housing78.

An*` inwardly extending collar 185 :atztheupper` end of housing 7 8 supports a bushing 86 rotatably` mounted about. the upper port-iron of shaft 6. A pluralitykof oil passages V87,

" similar tothe passages 63 inthe lower collar,l

connectY annular oil'space' .47 with-thefoil space 70 in the cap 58. y

. lThe oil is forced up from well 84, partly by thehead of oilin passage' 74, vand partly by `centrifugal force, some oil passing.. between bushing 80 andtheshaft 6, andsoi-ne passing through oil-passages 83. vThe oilin annular vspace i7k is elevatedby thel annular rib 57 as in theffirst formy oft-he invention, rthis oijl then passing 'between the "upper bushing. 86 Hand shaft V6, and through passages 87, f tothe oilV space in cap-70,'from which it is.

forced Athrough'radial 'passages `72 bac-lr into the .reservoir orV conduit74l, thus completing Vthe cycle. Y

"Iclaim: Y l. Ina device of the character described,

ofy the. shaft is vsecured' forV suspending the shaft in .a substantially'.upright position-,1 the shaft f having a lubricant. passage extending substantially .airially. therethrough, va rotat--v able hollowsleeve adapted to surround a por-V tion of the shaft fcoaxially therewith but spaced radially therefrom, a roller thrust bearing assembly comprising inner and outer i, race rings and a series cf interposed rollers,

- cured to and supported from the rotatable 153 assembly, and packing mea s mounted 'between the upper end of the sleeve and the shaft. i

2. ln a device of the character described, a shaft, means in which the upper portion of the shaft is secured for suspending the shaft in a substantially 'upright position, the shaft having a lubricant passage extending substantially axially therethrough, a rotatable hollow sleeve adapted to surround a portion of the shaft coaxially therewith but spaced radially therefrom, a roller thrust bearing assembly comprising inner and outer race rings and a series of interposed rollers1neans at the lower endV of the shaft for supporting the inner race ring, the outer race ring supporting the sleeve, a similar roller bearing assembly mounted between the upper portions ofthe shaft'and sleeve, a member secured to the lower end of the sleeve andenclosing the lower end of the shaft torform a well for lubricant, a pulverizing roller sesv cured to and supported from the rotatable assembly, and packing means mounted between the upper end of the sleeve and the shaft and means within the sleeve and rotatable therewith for elevating lubricant from the well to the upper portion of the sleeve.

3.- ln a deviceof the character described, Va

shaft, 'means in which the upper portion of the shaft is secured for suspending the shaftv in a substantially upright position, the shafthaving a. lubricant passagey extending substantially axially therethrough, a rotatable hollow sleeve adapted to surround a portion of the shaft coaxially therewith butY spaced radially therefrom, a rollerthrust'bearing assembly comprising inner and outer lrace rings and a series of interposed rollers, means at the lower end'of the shaft for supporting the inner racering, the outer race ring supporting the sleeve,a similar roller bearing assembly mounted between the upper portions of the shaft and sleeve, a member secured to the lower end of the sleeve and enclosing the lower end of the shaft to form a well for lubricant, a pulverizing rollersecured to and supported from the rotatable assembly, paclring means mounted betweenthe upper end of the Vsleeve and the shaft and aspiral flange projecting inwardly from the sleeve towardA lradially therefrom, a roller thrust bearing assembly 'comprising' inner and outer race rings and a series of interposed rollers, means at the lower end of the shaft for supporting the inner race ring, theouter race'ring supporting the sleeve, a similar roller bearing assembly mounted between the upper por tions of the shaft and sleeve, a 'cylinrdical bushing slidably enclosing the shaft and interposed between the inner racerings and thev shaft, the bushing having an .upper annular flange overlying t-he upper inner race ring, a

shock absorbing spring interposed-,between the bushing flange anda projecting collar on the shaft, a member secured to the lower end of the sleeve and enclosing the lower'end of the shaft to form awell forlubricant, a pulverizing roller secured to and supported from the rotatable assembly, and packing means Y mounted between the upper end of the sleeve and the shaftrandmeans within the sleeve and rotatable therewith for elevating lubricant from the well to t-he upper portion of the sleeve. Y

5. ln a device of the character described, a shaft, means in which the upper portion of the'shaft is secured for suspending the shaft in a substantially upright position, a rotatable assembly including a housing and a pulverizing roller enclosing the lower portion of the shaft, bearings between the shaft and housing, means for lubricating the bearings, and sealing means between the upper end of the housingV and the shaft comprising a collar on the shaft, there being a series of spiral grooves 1n the lower face of the collar, an annularcap on the housing projecting into proximity with the shaft and collar, and annular gaskets mounted in the cap and engaging the shaft .andthe lower face of the collar respectively.

6. In a device of the character described, a shaft, means in which the upper portion of the shaft is secured for suspending the shaft in a substantially upright position, a rotatable assembly including a housing and a pulverizing roller enclosing the lower portion of the shaft, bearings between the shaft and housing.rmeans for lubricating the bearings, and sealingmeans between the upper end of the housing and the shaft comprising a collar f on the shaft, an annular cap having aithreaded engagement with'V the upper end of the housing, means for locking the cap in place, the free end of the cap projecting into proximity to the shaft and collar, and annular lil lgaskets mounted: nztheeapfand :'engaging'the i, Yshatand the,leuwriace.of;the:.collarirespee-` *.vtiyely. f f y Y In combination,ia, trunnionshafhayoke l all) inauhich the .ftrunnion lis lpiv'otally' supported, a rocher secured fon :the trunnionshaft, a

.roller-supporting sha-ft the .upper vend Iot' .which .is secured in thefrocler so `.that Ithe Vy 'roller shaft is l .suspended Ain Aa substantially upright position, a pliluerizmglroller assem- ,rotatably mountedonl and .enclosing the :lower portion of; :the shaft; f and. supported Y thereby, bearings-betweenthe rrollerfassembly n." nu.)

, va rocker securedonthe tnunnionshaft, a aroll'-y j ftinuous'tlow of ylubricant -to th v prisrng .a supply passage rextendvmg"substanrpassages Withthe respectively.

andshaft-,and means for supplying@ scona .ear'ingscomtially .axially 4through the roller shaft, a return ,passagefin/ the upper portion o'fthe rollv.er shaft and.comnmnicatng .with :the .space Y in the `rotatable assemblyabove -the :bea-rings, separate inlet and outletpassages-inthe-tranv nion shaft, :and conduits connecting', theseV i supply and return'passages s. iinombinatioaa efnnionlshafaayke 1n which the trunnio'njis ,piyotallyfsupportech y Yer;supporting shaft 'the-upper tend. of jwhich 1s s ec'uredin the .rocker so that-'the roller [shaftis suspendedlin aj sfubstantiall-y-upnight position, fa Lpulyerizing rrollerf. assembly kro- .atably mounted' V'0.11 .andleno'losingfrthe Llower portion olthe Vshaft andgsitpportedthereby, `bearings between .the roller,assembly; and

shaft, randmeansfor supplying a-continuous .flow 'otlubricant tothe bearings comprising a supply. passage extending'substantially axi- Y ally through the roller shaft, a ret-urn passage in the upper portionA of vthe roller Ashat'tand communicating with the space in the rotatable assembly above the bearings, 'separate inlet v.and outlet passages in the trunnion shaft,

communicating passages formed in the rocker andshafts for connecting thereturn passages ywith the outlet passage, and ar-conduit conne'cting the upper'end of the supplyrpassage with the inlet passage.

9. In combination, a trunnionshatt, a'yoke in which the trunnon is pivotally supported,

la rocker secured on the trunnion shaft and projecting to one side thereof, a roller-supn porting shaft the upper endl of which is secured in the rocker so that the roller shaft'isj suspended in a substantially upright position, a pulverizing roller assembly rotatably mounted on and enclosing the lower portion v yof the shaft and Vsupported thereby, bearings between the roller assembly and shaft, and means for supplying a continuous owof lubricant to the bearings comprising asupply passage extendingk substantiallyaxially through the roller shaft, an annular return i passage surrounding the upper portion of the supply passage, a passage connectingVV the returnl passage with the space in the rotatable V:and shaft for connecting :the .outlet passage 'with :theannular 'return passage, anda con- ;duit connecting. theinlet :passage lwith :the uppfer-.end ogthev supply passage in fthe roller f ,Sha/ft; i 'i assembly'v above Vthe bearings, .separate inlet and outlet passagesformed-in the trunnion' shaft :and y opening .through l one end 4thereof, Vmeans for .conducting lubricantto and from these'y passages, a passage formed in the 'rocherll0. In combinatioma 'trunnion' shaft, a yoke in which :theftr'umiion ijs piuotally 'supiported, -a 'rocker secured onthe, trunnion Shaft, a roller-'supporting shaftsthe upper end Vof Which 'is-secured in'the rockersothat the lti-nufous owof lubricant-.to the bearings 'comshaft andcommunieating :with fltlefspace-:in i the rotatable assembly# above thebeafrlings, and conduits communicating Withtheisupply .and return passages i-n thefshaft forfconducting ylubricant to and from-:a source otl'ubri7 cant supply*` i Y D11, In combinatiomwa ftrunnion'shaft, :1 yoke .in which the trunnionz-isfpivotally supported, Irocker- :secured fon theflttrunni'ofn fshait, airoller-supporting shaft ,the :upper .end of `which lis secured ,-in the 'rocker- V'so 'that v./prsng a supply passage extending substan-V. .tially 'axially'through the rollershaft,-.a 1-ei 'turn passage inthe upper portionfoff thelrol'ler ,n

-the'reller -shaft ssuspended .in-:a substan` I tiallynpright fpesitiom-a. gpulyeria'ing 'roller .Y

assembly :rotatably'mounted on and enclosing .the lowergportion of :the sha-ft andsupp'orted 'l V thereby, beatingsbetweenztherohler assembly ,and shaft, and -means 4for supplying; :con-f ,pjrisinga supplyf'passageextendinggsubstans f .tialfly` .axially through the :roller shaft', an annular rreturn xxpassage surrounding the'vupper r:portionzef Ythe ,supply passage, .fapassage .connecting :the return passage 'with .the space inthe Aarotatyable :assembly .above thewbearings Yand yconduitscommunicatingmithfthesupply l, and return passagesfinithefshai't oriconductf inglubricant ,to land from -a source Voiflubriy cant/supply. i

n.12. .In adeviceof. the character described, Y

ash.aft, means i-n .which the-upper [portion ofthe Ishaft-is Asecured:for-suspending 2.the Y shaft `ninfa :substantially auprglht position, .fthe sli-fatt hanging; a lubricant .passage [extending substantially vfaenla'l'ly ftherethrough,v a .frotatable hollowfsleeu'eadapted.ito surround a portion of fthe shait't'fco axially therewith but spaced :radially therefrom throughout lthe I greater portion fof :its length, bearingswinter; posed between (the shaft' .and sleevewadj ac ent the lupperf-ial1dllower `@endsadl:`1 the sleeve, 'fa

`thrust collar carried by the lower endV of the "shaft and engaging beneath the lower bearing, a member secured to the lower end of the sleeve and enclosing the lcwer end of the shaft to form a lubricant well, a pulvcrizing roller secured to and supported from he rotatable assembly, packing means mounted at the upper end of the sleeve and engaging 'the shaft, and aspiral rib proJecting inwardly from the sleeve toward the shaft for elevating lubricant." Y v 13. In a device of the class described, a shaft, means in which theupper portion of the shaft is secured for suspending theshaft in a substantially upright pcsition, a1 rotatable assembly comprising 'a housing and a pulverizing rollerl enclosing the lower portion of the shaft, bearings between the shaft and housing, means for lubricating the bearings, and sealing means between the upper end of the housing` and the' shaft comprising a collar on the shaft. there being a spiral groove in the lower face of the collar, an annular capi on the housing projecting into proximity with the shaft and collar, and annular gaskets mounted in the cap andpengaging the shaft and the lower face of the collar respectivelv. i Y Y 14. In a device of the class described, a shaft, means in which the upper portion of the shaft is secured for suspending the-shaft in a substantially upright position, a rotatable assembly comprising a housing and a pulverizing roller enclosing the lower portion of the shaft'but spaced radially therefrom to leave an annular space between the housing and'shaft, bearings between the shaft and housing, sealing Vmeans'between the upper portion of the housing and the shaft, and

to the radial passage.V

nularreturn passage surrounding the upper l portion of the'supply passage, a substantially radial passage connecting the annular return passage with the space between thehousing Vand shaft beneath the sealing means,`a lubricant Well formed Within the rotatable/assembly, and means formed within the housing fer assisting in elevating lubricant from the well through the bearings and annular space 16. Ina device'. of the'class Vdescribed,a shaft, means in which the upper portion of the shaft is'secured for suspending thershaft in a substantially upright position, a v,ro-

tatable assembly comprising a housing and a pulverizing` roller enclosingthe lower portion ofthe shaft but spaced radially therefrom to leave an annular spa-ce between the housing and shaft, bearings-between the shaft and housing, sealing means-between the upper portion ofthe 'housing and the shaft, and

means forlubricating the bearings'comprising a lubricant supplyY passage extending Vsubstantially axially through the ishaft,'an

annular return passage surrounding the upper'portion of the supply passage, a substantially radial passage connecting the annular returnpassage with the space between the housing and shaft beneaththesealing means, a lubricantwell formed 'within'the rotatable assembly, and a spiral flange'projectin'g inwardlyfrom the housing' toward the VShaft for elevating lubricant throughthe annular space to the radial return passage.

MARTIN raison..

ing a. lubricant supply passage extending substantially axially through the shaft, an

annular return passage surrounding the upper portion ofthe supply passage, aV substantially radial passage connecting the annular return passage with the space between the housing and shaft beneath the sealing means,

a lubricant well formed within the rotatable i assembly, and means for elevating lubricant from the well through the bearings and annular space to the radial passage.

15.'In a device of the classV described, .a shaft, means in which the upper portionof the shaftis secured for suspending the shaft in a substantially upright position, a rotatable assembly comprising a housing and a pulverizing roller enclosing the lower portion of the shaft but spaced radially thereand housing, sealing means between the upper portion of the housing and the shaft, and means for lubricating the bearings comprising a lubricant supply passage extending sub- VVfrom-to leave an annular space between the Y housing and shaft, bearings between the shaft stantially axially through'the shaft, an an- 

